Bosch, H.

English

MPG.PuRe

Construction of WENDELSTEIN 7-X – Status and Prospects  H.-S. Bosch for the W7-X Team Max-Planck-Institut für Plasmaphysik, Euratom Association Teilinstitut Greifswald, Wendelsteinstraße 1, D-17491 Greifswald, Germany corresponding author: bosch@ipp.mpg.de  The WENDELSTEIN stellarator line developed by the Max-Planck Institute for Plasma Physics is continued with the superconducting device Wendelstein 7-X (W7-X). The W7-X stellarator, presently under construction in Greifswald, is “fully” optimised, based on the concept of quasi-isodynamicity. W7-X is consistently designed for a consistent operation of long-pulse (30min) reactor relevant plasmas. The advanced component design and the optimisation of the stellarator magnetic field configuration have been developed to ensure stable, high-beta steady state operation, thereby demonstrating the reactor potential of optimised stellarators.    The superconducting magnet system of W7-X consists of  50 non-planar coils (5 different geometry types), 20 planar coils for variation of the magnetic field configuration (2 different geometry types), a bus-bar system to electrically connect the coils , and a central support ring as well as  a set of supporting elements to form a mechanically stable system. The cryostat that also provides the thermal insulation of the cold magnet system, consists of the plasma vessel, the outer vessel, the ports, and the thermal insulation . The manufacturing of the W7-X components has progressed well over the past years, and many components are available for assembly. In parallel , the concept for assembly of the stellarator has been developed  At present, the first two out of 10 half-modules of the magnet system (each with seven coils strung onto one half-module of the plasma vessel) are being assembled.   In the present paper we give a status review of one of the largest superconducting fusion devices under construction world wide.  The recent progress is described and the current situation of the most important components of Wendelstein 7-X, technical challenges  and solutions are summarized. We will also give an overview over the assembly concept and the further planning until the completion of the device.   

Construction of WENDELSTEIN 7-X - Status and Prospects

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MPG.PuRe